The actor will guest-star in a Season 2 episode of the hit CBS drama as someone with a connection to Joan’s past, TVLine has learned exclusively.

Jordan will appear in an October installment as Joey Castoro, the son of the surgical patient who died in Watson’s care. The surgeon-turned-P.I. has an affinity for Joey, but her affections for him are tested when he comes to her with an unexpected request.

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When Elementary goes across the pond for its Season 2 premiere, we’ll meet at least one member of Holmes’ estranged family.

Welsh actor RhysIfans, known to The Amazing Spider-Man fans as Dr. Curt Connors (aka The Lizard), has taken on the recurring role of Sherlock’s sibling Mycroft.

The CBS drama’s London-set episode, which will be filmed on location, finds Sherlock revisiting an old case in England. While there, he and Joan stay with his older brother — at 221B Baker Street — despite the siblings’ terrible falling-out years earlier. During his stay, Sherlock and Mycroft will deal with the rift between them.

Ifans has worked primarily in film; in addition to Spider-Man, his credits include Harry Potter and the Deathly Hallows: Part 1, Elizabeth: The Golden Age, The Replacements and Notting Hill.

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Games of Thrones‘ Natalie Dormer has landed the pivotal role of Irene Adler on Elementary, CBS announced Tuesday.

The actress will appear as Sherlock Holmes’ former love in three episodes, beginning May 9 and climaxing in the show’s two-hour season finale on May 16.

Londoner Irene Adler was the only woman to truly capture Sherlock’s heart. It was revealed earlier this season that Moriarty was responsible for her death, which sent the investigator on a downward spiral into drug addiction.

“We’re moving to the next chapter in our show – and in some ways, to a previous chapter in Holmes’ story,” said executive producer creator Rob Doherty in a statement. “Irene Adler is perhaps the most pivotal relationship in Sherlock’s life, and I can’t think of an actress better suited to the challenge than Natalie.”

As for whether Irene might actually be alive, the EP revealed at TCA Press Tour in January that there was talk about exploring the character in flashback to “see why Sherlock would be drawn to this particular women — she’s got to be pretty unique — so we definitely want to meet her.”

In addition to her role as Joffrey’s intended bride, Margaery Tyrell, on Game of Thrones, Dormer is known for playing Anne Boleyn on The Tudors.